diff --git a/src/Dapper.Contrib/SqlMapperExtensions.cs b/src/Dapper.Contrib/SqlMapperExtensions.cs
index 9a30e805..2042f0c9 100644
--- a/src/Dapper.Contrib/SqlMapperExtensions.cs
+++ b/src/Dapper.Contrib/SqlMapperExtensions.cs
@@ -109,7 +109,11 @@ private static List<PropertyInfo> KeyPropertiesCache(Type type)
 
             if (keyProperties.Count == 0)
             {
-                var idProp = allProperties.Find(p => string.Equals(p.Name, "id", StringComparison.CurrentCultureIgnoreCase));
+                var idProp = allProperties.Find(p => string.Equals(p.Name, "id", StringComparison.OrdinalIgnoreCase));
+                if (idProp == null)
+                {
+                    idProp = allProperties.Find(p => string.Equals(p.Name, "id", StringComparison.CurrentCultureIgnoreCase));
+                }
                 if (idProp != null && !idProp.GetCustomAttributes(true).Any(a => a is ExplicitKeyAttribute))
                 {
                     keyProperties.Add(idProp);